net/ipv4/netfilter/ip_conntrack_standalone.c

   1 /* This file contains all the functions required for the standalone
   2    ip_conntrack module.
   3
   4    These are not required by the compatibility layer.
   5 */
   6
   7 /* (C) 1999-2001 Paul `Rusty' Russell
   8  * (C) 2002-2005 Netfilter Core Team <coreteam@netfilter.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/config.h>
  16 #include <linux/types.h>
  17 #include <linux/ip.h>
  18 #include <linux/netfilter.h>
  19 #include <linux/netfilter_ipv4.h>
  20 #include <linux/module.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/percpu.h>
  25 #ifdef CONFIG_SYSCTL
  26 #include <linux/sysctl.h>
  27 #endif
  28 #include <net/checksum.h>
  29 #include <net/ip.h>
  30 #include <net/route.h>
  31
  32 #define ASSERT_READ_LOCK(x)
  33 #define ASSERT_WRITE_LOCK(x)
  34
  35 #include <linux/netfilter_ipv4/ip_conntrack.h>
  36 #include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
  37 #include <linux/netfilter_ipv4/ip_conntrack_core.h>
  38 #include <linux/netfilter_ipv4/ip_conntrack_helper.h>
  39 #include <linux/netfilter_ipv4/listhelp.h>
  40
  41 #if 0
  42 #define DEBUGP printk
  43 #else
  44 #define DEBUGP(format, args...)
  45 #endif
  46
  47 MODULE_LICENSE("GPL");
  48
  49 extern atomic_t ip_conntrack_count;
  50 DECLARE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
  51
  52 static int kill_proto(struct ip_conntrack *i, void *data)
  53 {
  54         return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum ==
  55                         *((u_int8_t *) data));
  56 }
  57
  58 #ifdef CONFIG_PROC_FS
  59 static int
  60 print_tuple(struct seq_file *s, const struct ip_conntrack_tuple *tuple,
  61             struct ip_conntrack_protocol *proto)
  62 {
  63         seq_printf(s, "src=%u.%u.%u.%u dst=%u.%u.%u.%u ",
  64                    NIPQUAD(tuple->src.ip), NIPQUAD(tuple->dst.ip));
  65         return proto->print_tuple(s, tuple);
  66 }
  67
  68 #ifdef CONFIG_IP_NF_CT_ACCT
  69 static unsigned int
  70 seq_print_counters(struct seq_file *s,
  71                    const struct ip_conntrack_counter *counter)
  72 {
  73         return seq_printf(s, "packets=%llu bytes=%llu ",
  74                           (unsigned long long)counter->packets,
  75                           (unsigned long long)counter->bytes);
  76 }
  77 #else
  78 #define seq_print_counters(x, y)        0
  79 #endif
  80
  81 struct ct_iter_state {
  82         unsigned int bucket;
  83 };
  84
  85 static struct list_head *ct_get_first(struct seq_file *seq)
  86 {
  87         struct ct_iter_state *st = seq->private;
  88
  89         for (st->bucket = 0;
  90              st->bucket < ip_conntrack_htable_size;
  91              st->bucket++) {
  92                 if (!list_empty(&ip_conntrack_hash[st->bucket]))
  93                         return ip_conntrack_hash[st->bucket].next;
  94         }
  95         return NULL;
  96 }
  97
  98 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
  99 {
 100         struct ct_iter_state *st = seq->private;
 101
 102         head = head->next;
 103         while (head == &ip_conntrack_hash[st->bucket]) {
 104                 if (++st->bucket >= ip_conntrack_htable_size)
 105                         return NULL;
 106                 head = ip_conntrack_hash[st->bucket].next;
 107         }
 108         return head;
 109 }
 110
 111 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
 112 {
 113         struct list_head *head = ct_get_first(seq);
 114
 115         if (head)
 116                 while (pos && (head = ct_get_next(seq, head)))
 117                         pos--;
 118         return pos ? NULL : head;
 119 }
 120
 121 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
 122 {
 123         read_lock_bh(&ip_conntrack_lock);
 124         return ct_get_idx(seq, *pos);
 125 }
 126
 127 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 128 {
 129         (*pos)++;
 130         return ct_get_next(s, v);
 131 }
 132
 133 static void ct_seq_stop(struct seq_file *s, void *v)
 134 {
 135         read_unlock_bh(&ip_conntrack_lock);
 136 }
 137
 138 static int ct_seq_show(struct seq_file *s, void *v)
 139 {
 140         const struct ip_conntrack_tuple_hash *hash = v;
 141         const struct ip_conntrack *conntrack = tuplehash_to_ctrack(hash);
 142         struct ip_conntrack_protocol *proto;
 143
 144         ASSERT_READ_LOCK(&ip_conntrack_lock);
 145         IP_NF_ASSERT(conntrack);
 146
 147         /* we only want to print DIR_ORIGINAL */
 148         if (DIRECTION(hash))
 149                 return 0;
 150
 151         proto = __ip_conntrack_proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 152         IP_NF_ASSERT(proto);
 153
 154         if (seq_printf(s, "%-8s %u %ld ",
 155                       proto->name,
 156                       conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 157                       timer_pending(&conntrack->timeout)
 158                       ? (long)(conntrack->timeout.expires - jiffies)/HZ
 159                       : 0) != 0)
 160                 return -ENOSPC;
 161
 162         if (proto->print_conntrack(s, conntrack))
 163                 return -ENOSPC;
 164
 165         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 166                         proto))
 167                 return -ENOSPC;
 168
 169 #if defined(CONFIG_VNET) || defined(CONFIG_VNET_MODULE)
 170         if (seq_printf(s, "xid=%d\n", conntrack->xid[IP_CT_DIR_ORIGINAL]))
 171                 return 1;
 172 #endif
 173
 174         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
 175                 return -ENOSPC;
 176
 177         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
 178                 if (seq_printf(s, "[UNREPLIED] "))
 179                         return -ENOSPC;
 180
 181         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
 182                         proto))
 183                 return -ENOSPC;
 184
 185 #if defined(CONFIG_VNET) || defined(CONFIG_VNET_MODULE)
 186         if (seq_printf(s, "xid=%d\n", conntrack->xid[IP_CT_DIR_REPLY]))
 187                 return 1;
 188 #endif
 189
 190         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
 191                 return -ENOSPC;
 192
 193         if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
 194                 if (seq_printf(s, "[ASSURED] "))
 195                         return -ENOSPC;
 196
 197 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
 198         if (seq_printf(s, "mark=%u ", conntrack->mark))
 199                 return -ENOSPC;
 200 #endif
 201
 202         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
 203                 return -ENOSPC;
 204
 205         return 0;
 206 }
 207
 208 static struct seq_operations ct_seq_ops = {
 209         .start = ct_seq_start,
 210         .next  = ct_seq_next,
 211         .stop  = ct_seq_stop,
 212         .show  = ct_seq_show
 213 };
 214
 215 static int ct_open(struct inode *inode, struct file *file)
 216 {
 217         struct seq_file *seq;
 218         struct ct_iter_state *st;
 219         int ret;
 220
 221         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 222         if (st == NULL)
 223                 return -ENOMEM;
 224         ret = seq_open(file, &ct_seq_ops);
 225         if (ret)
 226                 goto out_free;
 227         seq          = file->private_data;
 228         seq->private = st;
 229         memset(st, 0, sizeof(struct ct_iter_state));
 230         return ret;
 231 out_free:
 232         kfree(st);
 233         return ret;
 234 }
 235
 236 static struct file_operations ct_file_ops = {
 237         .owner   = THIS_MODULE,
 238         .open    = ct_open,
 239         .read    = seq_read,
 240         .llseek  = seq_lseek,
 241         .release = seq_release_private,
 242 };
 243
 244 /* expects */
 245 static void *exp_seq_start(struct seq_file *s, loff_t *pos)
 246 {
 247         struct list_head *e = &ip_conntrack_expect_list;
 248         loff_t i;
 249
 250         /* strange seq_file api calls stop even if we fail,
 251          * thus we need to grab lock since stop unlocks */
 252         read_lock_bh(&ip_conntrack_lock);
 253
 254         if (list_empty(e))
 255                 return NULL;
 256
 257         for (i = 0; i <= *pos; i++) {
 258                 e = e->next;
 259                 if (e == &ip_conntrack_expect_list)
 260                         return NULL;
 261         }
 262         return e;
 263 }
 264
 265 static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
 266 {
 267         struct list_head *e = v;
 268
 269         ++*pos;
 270         e = e->next;
 271
 272         if (e == &ip_conntrack_expect_list)
 273                 return NULL;
 274
 275         return e;
 276 }
 277
 278 static void exp_seq_stop(struct seq_file *s, void *v)
 279 {
 280         read_unlock_bh(&ip_conntrack_lock);
 281 }
 282
 283 static int exp_seq_show(struct seq_file *s, void *v)
 284 {
 285         struct ip_conntrack_expect *expect = v;
 286
 287         if (expect->timeout.function)
 288                 seq_printf(s, "%ld ", timer_pending(&expect->timeout)
 289                            ? (long)(expect->timeout.expires - jiffies)/HZ : 0);
 290         else
 291                 seq_printf(s, "- ");
 292
 293         seq_printf(s, "proto=%u ", expect->tuple.dst.protonum);
 294
 295         print_tuple(s, &expect->tuple,
 296                     __ip_conntrack_proto_find(expect->tuple.dst.protonum));
 297         return seq_putc(s, '\n');
 298 }
 299
 300 static struct seq_operations exp_seq_ops = {
 301         .start = exp_seq_start,
 302         .next = exp_seq_next,
 303         .stop = exp_seq_stop,
 304         .show = exp_seq_show
 305 };
 306
 307 static int exp_open(struct inode *inode, struct file *file)
 308 {
 309         return seq_open(file, &exp_seq_ops);
 310 }
 311
 312 static struct file_operations exp_file_ops = {
 313         .owner   = THIS_MODULE,
 314         .open    = exp_open,
 315         .read    = seq_read,
 316         .llseek  = seq_lseek,
 317         .release = seq_release
 318 };
 319
 320 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 321 {
 322         int cpu;
 323
 324         if (*pos == 0)
 325                 return SEQ_START_TOKEN;
 326
 327         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 328                 if (!cpu_possible(cpu))
 329                         continue;
 330                 *pos = cpu+1;
 331                 return &per_cpu(ip_conntrack_stat, cpu);
 332         }
 333
 334         return NULL;
 335 }
 336
 337 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 338 {
 339         int cpu;
 340
 341         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 342                 if (!cpu_possible(cpu))
 343                         continue;
 344                 *pos = cpu+1;
 345                 return &per_cpu(ip_conntrack_stat, cpu);
 346         }
 347
 348         return NULL;
 349 }
 350
 351 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 352 {
 353 }
 354
 355 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 356 {
 357         unsigned int nr_conntracks = atomic_read(&ip_conntrack_count);
 358         struct ip_conntrack_stat *st = v;
 359
 360         if (v == SEQ_START_TOKEN) {
 361                 seq_printf(seq, "entries  searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error  expect_new expect_create expect_delete\n");
 362                 return 0;
 363         }
 364
 365         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 366                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 367                    nr_conntracks,
 368                    st->searched,
 369                    st->found,
 370                    st->new,
 371                    st->invalid,
 372                    st->ignore,
 373                    st->delete,
 374                    st->delete_list,
 375                    st->insert,
 376                    st->insert_failed,
 377                    st->drop,
 378                    st->early_drop,
 379                    st->error,
 380
 381                    st->expect_new,
 382                    st->expect_create,
 383                    st->expect_delete
 384                 );
 385         return 0;
 386 }
 387
 388 static struct seq_operations ct_cpu_seq_ops = {
 389         .start  = ct_cpu_seq_start,
 390         .next   = ct_cpu_seq_next,
 391         .stop   = ct_cpu_seq_stop,
 392         .show   = ct_cpu_seq_show,
 393 };
 394
 395 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 396 {
 397         return seq_open(file, &ct_cpu_seq_ops);
 398 }
 399
 400 static struct file_operations ct_cpu_seq_fops = {
 401         .owner   = THIS_MODULE,
 402         .open    = ct_cpu_seq_open,
 403         .read    = seq_read,
 404         .llseek  = seq_lseek,
 405         .release = seq_release_private,
 406 };
 407 #endif
 408
 409 static unsigned int ip_confirm(unsigned int hooknum,
 410                                struct sk_buff **pskb,
 411                                const struct net_device *in,
 412                                const struct net_device *out,
 413                                int (*okfn)(struct sk_buff *))
 414 {
 415         /* We've seen it coming out the other side: confirm it */
 416         return ip_conntrack_confirm(pskb);
 417 }
 418
 419 static unsigned int ip_conntrack_help(unsigned int hooknum,
 420                                       struct sk_buff **pskb,
 421                                       const struct net_device *in,
 422                                       const struct net_device *out,
 423                                       int (*okfn)(struct sk_buff *))
 424 {
 425         struct ip_conntrack *ct;
 426         enum ip_conntrack_info ctinfo;
 427
 428         /* This is where we call the helper: as the packet goes out. */
 429         ct = ip_conntrack_get(*pskb, &ctinfo);
 430         if (ct && ct->helper) {
 431                 unsigned int ret;
 432                 ret = ct->helper->help(pskb, ct, ctinfo);
 433                 if (ret != NF_ACCEPT)
 434                         return ret;
 435         }
 436         return NF_ACCEPT;
 437 }
 438
 439 static unsigned int ip_conntrack_defrag(unsigned int hooknum,
 440                                         struct sk_buff **pskb,
 441                                         const struct net_device *in,
 442                                         const struct net_device *out,
 443                                         int (*okfn)(struct sk_buff *))
 444 {
 445 #if !defined(CONFIG_IP_NF_NAT) && !defined(CONFIG_IP_NF_NAT_MODULE)
 446         /* Previously seen (loopback)?  Ignore.  Do this before
 447            fragment check. */
 448         if ((*pskb)->nfct)
 449                 return NF_ACCEPT;
 450 #endif
 451
 452         /* Gather fragments. */
 453         if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
 454                 *pskb = ip_ct_gather_frags(*pskb,
 455                                            hooknum == NF_IP_PRE_ROUTING ?
 456                                            IP_DEFRAG_CONNTRACK_IN :
 457                                            IP_DEFRAG_CONNTRACK_OUT);
 458                 if (!*pskb)
 459                         return NF_STOLEN;
 460         }
 461         return NF_ACCEPT;
 462 }
 463
 464 static unsigned int ip_conntrack_local(unsigned int hooknum,
 465                                        struct sk_buff **pskb,
 466                                        const struct net_device *in,
 467                                        const struct net_device *out,
 468                                        int (*okfn)(struct sk_buff *))
 469 {
 470         /* root is playing with raw sockets. */
 471         if ((*pskb)->len < sizeof(struct iphdr)
 472             || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
 473                 if (net_ratelimit())
 474                         printk("ipt_hook: happy cracking.\n");
 475                 return NF_ACCEPT;
 476         }
 477         return ip_conntrack_in(hooknum, pskb, in, out, okfn);
 478 }
 479
 480 /* Connection tracking may drop packets, but never alters them, so
 481    make it the first hook. */
 482 static struct nf_hook_ops ip_conntrack_ops[] = {
 483         {
 484                 .hook           = ip_conntrack_defrag,
 485                 .owner          = THIS_MODULE,
 486                 .pf             = PF_INET,
 487                 .hooknum        = NF_IP_PRE_ROUTING,
 488                 .priority       = NF_IP_PRI_CONNTRACK_DEFRAG,
 489         },
 490         {
 491                 .hook           = ip_conntrack_in,
 492                 .owner          = THIS_MODULE,
 493                 .pf             = PF_INET,
 494                 .hooknum        = NF_IP_PRE_ROUTING,
 495                 .priority       = NF_IP_PRI_CONNTRACK,
 496         },
 497         {
 498                 .hook           = ip_conntrack_defrag,
 499                 .owner          = THIS_MODULE,
 500                 .pf             = PF_INET,
 501                 .hooknum        = NF_IP_LOCAL_OUT,
 502                 .priority       = NF_IP_PRI_CONNTRACK_DEFRAG,
 503         },
 504         {
 505                 .hook           = ip_conntrack_local,
 506                 .owner          = THIS_MODULE,
 507                 .pf             = PF_INET,
 508                 .hooknum        = NF_IP_LOCAL_OUT,
 509                 .priority       = NF_IP_PRI_CONNTRACK,
 510         },
 511         {
 512                 .hook           = ip_conntrack_help,
 513                 .owner          = THIS_MODULE,
 514                 .pf             = PF_INET,
 515                 .hooknum        = NF_IP_POST_ROUTING,
 516                 .priority       = NF_IP_PRI_CONNTRACK_HELPER,
 517         },
 518         {
 519                 .hook           = ip_conntrack_help,
 520                 .owner          = THIS_MODULE,
 521                 .pf             = PF_INET,
 522                 .hooknum        = NF_IP_LOCAL_IN,
 523                 .priority       = NF_IP_PRI_CONNTRACK_HELPER,
 524         },
 525         {
 526                 .hook           = ip_confirm,
 527                 .owner          = THIS_MODULE,
 528                 .pf             = PF_INET,
 529                 .hooknum        = NF_IP_POST_ROUTING,
 530                 .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
 531         },
 532         {
 533                 .hook           = ip_confirm,
 534                 .owner          = THIS_MODULE,
 535                 .pf             = PF_INET,
 536                 .hooknum        = NF_IP_LOCAL_IN,
 537                 .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
 538         },
 539 };
 540
 541 /* Sysctl support */
 542
 543 #ifdef CONFIG_SYSCTL
 544
 545 /* From ip_conntrack_core.c */
 546 extern int ip_conntrack_max;
 547 extern unsigned int ip_conntrack_htable_size;
 548
 549 /* From ip_conntrack_proto_tcp.c */
 550 extern unsigned int ip_ct_tcp_timeout_syn_sent;
 551 extern unsigned int ip_ct_tcp_timeout_syn_recv;
 552 extern unsigned int ip_ct_tcp_timeout_established;
 553 extern unsigned int ip_ct_tcp_timeout_fin_wait;
 554 extern unsigned int ip_ct_tcp_timeout_close_wait;
 555 extern unsigned int ip_ct_tcp_timeout_last_ack;
 556 extern unsigned int ip_ct_tcp_timeout_time_wait;
 557 extern unsigned int ip_ct_tcp_timeout_close;
 558 extern unsigned int ip_ct_tcp_timeout_max_retrans;
 559 extern int ip_ct_tcp_loose;
 560 extern int ip_ct_tcp_be_liberal;
 561 extern int ip_ct_tcp_max_retrans;
 562
 563 /* From ip_conntrack_proto_udp.c */
 564 extern unsigned int ip_ct_udp_timeout;
 565 extern unsigned int ip_ct_udp_timeout_stream;
 566
 567 /* From ip_conntrack_proto_icmp.c */
 568 extern unsigned int ip_ct_icmp_timeout;
 569
 570 /* From ip_conntrack_proto_icmp.c */
 571 extern unsigned int ip_ct_generic_timeout;
 572
 573 /* Log invalid packets of a given protocol */
 574 static int log_invalid_proto_min = 0;
 575 static int log_invalid_proto_max = 255;
 576
 577 static struct ctl_table_header *ip_ct_sysctl_header;
 578
 579 static ctl_table ip_ct_sysctl_table[] = {
 580         {
 581                 .ctl_name       = NET_IPV4_NF_CONNTRACK_MAX,
 582                 .procname       = "ip_conntrack_max",
 583                 .data           = &ip_conntrack_max,
 584                 .maxlen         = sizeof(int),
 585                 .mode           = 0644,
 586                 .proc_handler   = &proc_dointvec,
 587         },
 588         {
 589                 .ctl_name       = NET_IPV4_NF_CONNTRACK_COUNT,
 590                 .procname       = "ip_conntrack_count",
 591                 .data           = &ip_conntrack_count,
 592                 .maxlen         = sizeof(int),
 593                 .mode           = 0444,
 594                 .proc_handler   = &proc_dointvec,
 595         },
 596         {
 597                 .ctl_name       = NET_IPV4_NF_CONNTRACK_BUCKETS,
 598                 .procname       = "ip_conntrack_buckets",
 599                 .data           = &ip_conntrack_htable_size,
 600                 .maxlen         = sizeof(unsigned int),
 601                 .mode           = 0444,
 602                 .proc_handler   = &proc_dointvec,
 603         },
 604         {
 605                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
 606                 .procname       = "ip_conntrack_tcp_timeout_syn_sent",
 607                 .data           = &ip_ct_tcp_timeout_syn_sent,
 608                 .maxlen         = sizeof(unsigned int),
 609                 .mode           = 0644,
 610                 .proc_handler   = &proc_dointvec_jiffies,
 611         },
 612         {
 613                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
 614                 .procname       = "ip_conntrack_tcp_timeout_syn_recv",
 615                 .data           = &ip_ct_tcp_timeout_syn_recv,
 616                 .maxlen         = sizeof(unsigned int),
 617                 .mode           = 0644,
 618                 .proc_handler   = &proc_dointvec_jiffies,
 619         },
 620         {
 621                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
 622                 .procname       = "ip_conntrack_tcp_timeout_established",
 623                 .data           = &ip_ct_tcp_timeout_established,
 624                 .maxlen         = sizeof(unsigned int),
 625                 .mode           = 0644,
 626                 .proc_handler   = &proc_dointvec_jiffies,
 627         },
 628         {
 629                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
 630                 .procname       = "ip_conntrack_tcp_timeout_fin_wait",
 631                 .data           = &ip_ct_tcp_timeout_fin_wait,
 632                 .maxlen         = sizeof(unsigned int),
 633                 .mode           = 0644,
 634                 .proc_handler   = &proc_dointvec_jiffies,
 635         },
 636         {
 637                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
 638                 .procname       = "ip_conntrack_tcp_timeout_close_wait",
 639                 .data           = &ip_ct_tcp_timeout_close_wait,
 640                 .maxlen         = sizeof(unsigned int),
 641                 .mode           = 0644,
 642                 .proc_handler   = &proc_dointvec_jiffies,
 643         },
 644         {
 645                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
 646                 .procname       = "ip_conntrack_tcp_timeout_last_ack",
 647                 .data           = &ip_ct_tcp_timeout_last_ack,
 648                 .maxlen         = sizeof(unsigned int),
 649                 .mode           = 0644,
 650                 .proc_handler   = &proc_dointvec_jiffies,
 651         },
 652         {
 653                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
 654                 .procname       = "ip_conntrack_tcp_timeout_time_wait",
 655                 .data           = &ip_ct_tcp_timeout_time_wait,
 656                 .maxlen         = sizeof(unsigned int),
 657                 .mode           = 0644,
 658                 .proc_handler   = &proc_dointvec_jiffies,
 659         },
 660         {
 661                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
 662                 .procname       = "ip_conntrack_tcp_timeout_close",
 663                 .data           = &ip_ct_tcp_timeout_close,
 664                 .maxlen         = sizeof(unsigned int),
 665                 .mode           = 0644,
 666                 .proc_handler   = &proc_dointvec_jiffies,
 667         },
 668         {
 669                 .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT,
 670                 .procname       = "ip_conntrack_udp_timeout",
 671                 .data           = &ip_ct_udp_timeout,
 672                 .maxlen         = sizeof(unsigned int),
 673                 .mode           = 0644,
 674                 .proc_handler   = &proc_dointvec_jiffies,
 675         },
 676         {
 677                 .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
 678                 .procname       = "ip_conntrack_udp_timeout_stream",
 679                 .data           = &ip_ct_udp_timeout_stream,
 680                 .maxlen         = sizeof(unsigned int),
 681                 .mode           = 0644,
 682                 .proc_handler   = &proc_dointvec_jiffies,
 683         },
 684         {
 685                 .ctl_name       = NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT,
 686                 .procname       = "ip_conntrack_icmp_timeout",
 687                 .data           = &ip_ct_icmp_timeout,
 688                 .maxlen         = sizeof(unsigned int),
 689                 .mode           = 0644,
 690                 .proc_handler   = &proc_dointvec_jiffies,
 691         },
 692         {
 693                 .ctl_name       = NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT,
 694                 .procname       = "ip_conntrack_generic_timeout",
 695                 .data           = &ip_ct_generic_timeout,
 696                 .maxlen         = sizeof(unsigned int),
 697                 .mode           = 0644,
 698                 .proc_handler   = &proc_dointvec_jiffies,
 699         },
 700         {
 701                 .ctl_name       = NET_IPV4_NF_CONNTRACK_LOG_INVALID,
 702                 .procname       = "ip_conntrack_log_invalid",
 703                 .data           = &ip_ct_log_invalid,
 704                 .maxlen         = sizeof(unsigned int),
 705                 .mode           = 0644,
 706                 .proc_handler   = &proc_dointvec_minmax,
 707                 .strategy       = &sysctl_intvec,
 708                 .extra1         = &log_invalid_proto_min,
 709                 .extra2         = &log_invalid_proto_max,
 710         },
 711         {
 712                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
 713                 .procname       = "ip_conntrack_tcp_timeout_max_retrans",
 714                 .data           = &ip_ct_tcp_timeout_max_retrans,
 715                 .maxlen         = sizeof(unsigned int),
 716                 .mode           = 0644,
 717                 .proc_handler   = &proc_dointvec_jiffies,
 718         },
 719         {
 720                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_LOOSE,
 721                 .procname       = "ip_conntrack_tcp_loose",
 722                 .data           = &ip_ct_tcp_loose,
 723                 .maxlen         = sizeof(unsigned int),
 724                 .mode           = 0644,
 725                 .proc_handler   = &proc_dointvec,
 726         },
 727         {
 728                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL,
 729                 .procname       = "ip_conntrack_tcp_be_liberal",
 730                 .data           = &ip_ct_tcp_be_liberal,
 731                 .maxlen         = sizeof(unsigned int),
 732                 .mode           = 0644,
 733                 .proc_handler   = &proc_dointvec,
 734         },
 735         {
 736                 .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS,
 737                 .procname       = "ip_conntrack_tcp_max_retrans",
 738                 .data           = &ip_ct_tcp_max_retrans,
 739                 .maxlen         = sizeof(unsigned int),
 740                 .mode           = 0644,
 741                 .proc_handler   = &proc_dointvec,
 742         },
 743         { .ctl_name = 0 }
 744 };
 745
 746 #define NET_IP_CONNTRACK_MAX 2089
 747
 748 static ctl_table ip_ct_netfilter_table[] = {
 749         {
 750                 .ctl_name       = NET_IPV4_NETFILTER,
 751                 .procname       = "netfilter",
 752                 .mode           = 0555,
 753                 .child          = ip_ct_sysctl_table,
 754         },
 755         {
 756                 .ctl_name       = NET_IP_CONNTRACK_MAX,
 757                 .procname       = "ip_conntrack_max",
 758                 .data           = &ip_conntrack_max,
 759                 .maxlen         = sizeof(int),
 760                 .mode           = 0644,
 761                 .proc_handler   = &proc_dointvec
 762         },
 763         { .ctl_name = 0 }
 764 };
 765
 766 static ctl_table ip_ct_ipv4_table[] = {
 767         {
 768                 .ctl_name       = NET_IPV4,
 769                 .procname       = "ipv4",
 770                 .mode           = 0555,
 771                 .child          = ip_ct_netfilter_table,
 772         },
 773         { .ctl_name = 0 }
 774 };
 775
 776 static ctl_table ip_ct_net_table[] = {
 777         {
 778                 .ctl_name       = CTL_NET,
 779                 .procname       = "net",
 780                 .mode           = 0555,
 781                 .child          = ip_ct_ipv4_table,
 782         },
 783         { .ctl_name = 0 }
 784 };
 785
 786 EXPORT_SYMBOL(ip_ct_log_invalid);
 787 #endif /* CONFIG_SYSCTL */
 788
 789 /* FIXME: Allow NULL functions and sub in pointers to generic for
 790    them. --RR */
 791 int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto)
 792 {
 793         int ret = 0;
 794
 795         write_lock_bh(&ip_conntrack_lock);
 796         if (ip_ct_protos[proto->proto] != &ip_conntrack_generic_protocol) {
 797                 ret = -EBUSY;
 798                 goto out;
 799         }
 800         ip_ct_protos[proto->proto] = proto;
 801  out:
 802         write_unlock_bh(&ip_conntrack_lock);
 803         return ret;
 804 }
 805
 806 void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto)
 807 {
 808         write_lock_bh(&ip_conntrack_lock);
 809         ip_ct_protos[proto->proto] = &ip_conntrack_generic_protocol;
 810         write_unlock_bh(&ip_conntrack_lock);
 811
 812         /* Somebody could be still looking at the proto in bh. */
 813         synchronize_net();
 814
 815         /* Remove all contrack entries for this protocol */
 816         ip_ct_iterate_cleanup(kill_proto, &proto->proto);
 817 }
 818
 819 static int __init ip_conntrack_standalone_init(void)
 820 {
 821 #ifdef CONFIG_PROC_FS
 822         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 823 #endif
 824         int ret = 0;
 825
 826         ret = ip_conntrack_init();
 827         if (ret < 0)
 828                 return ret;
 829
 830 #ifdef CONFIG_PROC_FS
 831         ret = -ENOMEM;
 832         proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
 833         if (!proc) goto cleanup_init;
 834
 835         proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
 836                                         &exp_file_ops);
 837         if (!proc_exp) goto cleanup_proc;
 838
 839         proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
 840         if (!proc_stat)
 841                 goto cleanup_proc_exp;
 842
 843         proc_stat->proc_fops = &ct_cpu_seq_fops;
 844         proc_stat->owner = THIS_MODULE;
 845 #endif
 846
 847         ret = nf_register_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
 848         if (ret < 0) {
 849                 printk("ip_conntrack: can't register hooks.\n");
 850                 goto cleanup_proc_stat;
 851         }
 852 #ifdef CONFIG_SYSCTL
 853         ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0);
 854         if (ip_ct_sysctl_header == NULL) {
 855                 printk("ip_conntrack: can't register to sysctl.\n");
 856                 ret = -ENOMEM;
 857                 goto cleanup_hooks;
 858         }
 859 #endif
 860         return ret;
 861
 862 #ifdef CONFIG_SYSCTL
 863  cleanup_hooks:
 864         nf_unregister_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
 865 #endif
 866  cleanup_proc_stat:
 867 #ifdef CONFIG_PROC_FS
 868         remove_proc_entry("ip_conntrack", proc_net_stat);
 869  cleanup_proc_exp:
 870         proc_net_remove("ip_conntrack_expect");
 871  cleanup_proc:
 872         proc_net_remove("ip_conntrack");
 873  cleanup_init:
 874 #endif /* CONFIG_PROC_FS */
 875         ip_conntrack_cleanup();
 876         return ret;
 877 }
 878
 879 static void __exit ip_conntrack_standalone_fini(void)
 880 {
 881         synchronize_net();
 882 #ifdef CONFIG_SYSCTL
 883         unregister_sysctl_table(ip_ct_sysctl_header);
 884 #endif
 885         nf_unregister_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
 886 #ifdef CONFIG_PROC_FS
 887         remove_proc_entry("ip_conntrack", proc_net_stat);
 888         proc_net_remove("ip_conntrack_expect");
 889         proc_net_remove("ip_conntrack");
 890 #endif /* CONFIG_PROC_FS */
 891         ip_conntrack_cleanup();
 892 }
 893
 894 module_init(ip_conntrack_standalone_init);
 895 module_exit(ip_conntrack_standalone_fini);
 896
 897 /* Some modules need us, but don't depend directly on any symbol.
 898    They should call this. */
 899 void need_conntrack(void)
 900 {
 901 }
 902
 903 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
 904 EXPORT_SYMBOL_GPL(ip_conntrack_chain);
 905 EXPORT_SYMBOL_GPL(ip_conntrack_expect_chain);
 906 EXPORT_SYMBOL_GPL(ip_conntrack_register_notifier);
 907 EXPORT_SYMBOL_GPL(ip_conntrack_unregister_notifier);
 908 EXPORT_SYMBOL_GPL(__ip_ct_event_cache_init);
 909 EXPORT_PER_CPU_SYMBOL_GPL(ip_conntrack_ecache);
 910 #endif
 911 EXPORT_SYMBOL(ip_conntrack_protocol_register);
 912 EXPORT_SYMBOL(ip_conntrack_protocol_unregister);
 913 EXPORT_SYMBOL(ip_ct_get_tuple);
 914 EXPORT_SYMBOL(invert_tuplepr);
 915 EXPORT_SYMBOL(ip_conntrack_alter_reply);
 916 EXPORT_SYMBOL(ip_conntrack_destroyed);
 917 EXPORT_SYMBOL(need_conntrack);
 918 EXPORT_SYMBOL(ip_conntrack_helper_register);
 919 EXPORT_SYMBOL(ip_conntrack_helper_unregister);
 920 EXPORT_SYMBOL(ip_ct_iterate_cleanup);
 921 EXPORT_SYMBOL(__ip_ct_refresh_acct);
 922
 923 EXPORT_SYMBOL(ip_conntrack_expect_alloc);
 924 EXPORT_SYMBOL(ip_conntrack_expect_put);
 925 EXPORT_SYMBOL_GPL(__ip_conntrack_expect_find);
 926 EXPORT_SYMBOL_GPL(ip_conntrack_expect_find);
 927 EXPORT_SYMBOL(ip_conntrack_expect_related);
 928 EXPORT_SYMBOL(ip_conntrack_unexpect_related);
 929 EXPORT_SYMBOL_GPL(ip_conntrack_expect_list);
 930 EXPORT_SYMBOL_GPL(ip_ct_unlink_expect);
 931
 932 EXPORT_SYMBOL(ip_conntrack_tuple_taken);
 933 EXPORT_SYMBOL(ip_ct_gather_frags);
 934 EXPORT_SYMBOL(ip_conntrack_htable_size);
 935 EXPORT_SYMBOL(ip_conntrack_lock);
 936 EXPORT_SYMBOL(ip_conntrack_hash);
 937 EXPORT_SYMBOL(ip_conntrack_untracked);
 938 EXPORT_SYMBOL_GPL(ip_conntrack_find_get);
 939 #ifdef CONFIG_IP_NF_NAT_NEEDED
 940 EXPORT_SYMBOL(ip_conntrack_tcp_update);
 941 #endif
 942
 943 EXPORT_SYMBOL_GPL(ip_conntrack_flush);
 944 EXPORT_SYMBOL_GPL(__ip_conntrack_find);
 945
 946 EXPORT_SYMBOL_GPL(ip_conntrack_alloc);
 947 EXPORT_SYMBOL_GPL(ip_conntrack_free);
 948 EXPORT_SYMBOL_GPL(ip_conntrack_hash_insert);
 949
 950 EXPORT_SYMBOL_GPL(ip_ct_remove_expectations);
 951
 952 EXPORT_SYMBOL_GPL(ip_conntrack_helper_find_get);
 953 EXPORT_SYMBOL_GPL(ip_conntrack_helper_put);
 954 EXPORT_SYMBOL_GPL(__ip_conntrack_helper_find_byname);
 955
 956 EXPORT_SYMBOL_GPL(ip_conntrack_proto_find_get);
 957 EXPORT_SYMBOL_GPL(ip_conntrack_proto_put);
 958 EXPORT_SYMBOL_GPL(__ip_conntrack_proto_find);
 959 #if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
 960     defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
 961 EXPORT_SYMBOL_GPL(ip_ct_port_tuple_to_nfattr);
 962 EXPORT_SYMBOL_GPL(ip_ct_port_nfattr_to_tuple);
 963 #endif